Add Ascend NPU support for SDXL. (#7916)

Co-authored-by: mhh001 <mahonghao1@huawei.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

examples/text_to_image/train_text_to_image_sdxl.py

@@ -50,7 +50,7 @@ from diffusers.optimization import get_scheduler
 from diffusers.training_utils import EMAModel, compute_snr
 from diffusers.utils import check_min_version, is_wandb_available
 from diffusers.utils.hub_utils import load_or_create_model_card, populate_model_card
-from diffusers.utils.import_utils import is_xformers_available
+from diffusers.utils.import_utils import is_torch_npu_available, is_xformers_available
 from diffusers.utils.torch_utils import is_compiled_module
 
 
@@ -58,7 +58,8 @@ from diffusers.utils.torch_utils import is_compiled_module
 check_min_version("0.28.0.dev0")
 
 logger = get_logger(__name__)
-
+if is_torch_npu_available():
+    torch.npu.config.allow_internal_format = False
 
 DATASET_NAME_MAPPING = {
     "lambdalabs/naruto-blip-captions": ("image", "text"),
@@ -460,6 +461,9 @@ def parse_args(input_args=None):
         ),
     )
     parser.add_argument("--local_rank", type=int, default=-1, help="For distributed training: local_rank")
+    parser.add_argument(
+        "--enable_npu_flash_attention", action="store_true", help="Whether or not to use npu flash attention."
+    )
     parser.add_argument(
         "--enable_xformers_memory_efficient_attention", action="store_true", help="Whether or not to use xformers."
     )
@@ -716,7 +720,12 @@ def main(args):
             args.pretrained_model_name_or_path, subfolder="unet", revision=args.revision, variant=args.variant
         )
         ema_unet = EMAModel(ema_unet.parameters(), model_cls=UNet2DConditionModel, model_config=ema_unet.config)
-
+    if args.enable_npu_flash_attention:
+        if is_torch_npu_available():
+            logger.info("npu flash attention enabled.")
+            unet.enable_npu_flash_attention()
+        else:
+            raise ValueError("npu flash attention requires torch_npu extensions and is supported only on npu devices.")
     if args.enable_xformers_memory_efficient_attention:
         if is_xformers_available():
             import xformers